A Guide for the Electric Testing of Telegraph Cables
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29 X I ' calculated at 75° F. -will, with Hooper's core, be , or xl x 1' 026' (see Table II.). This number, with which it has been necessary to divide or multiply the result, so as to reduce from one temperature to another, is termed the temperature coefficient. When therefore the insulation has been measured at t degrees below 75°, the insulation per knot at 75° will be nxv' X (t>10000xl DXU'x 1-026' ' The resistance at 75° F. for gutta-percha will be found by using in the formula, instead of ...l - 026* as with Hooper's core, 1"076* with ordinary gutta-percha (see Table III.), and 1'080* with Willoughby Smith's gutta-percha (see Table IV.).
If the constant of the galvanometer is taken with the whole battery, a shunt v' = 100, and a resistance of 10,000 Ohms, then the insulation at the observed temperature will v vl "When the temperature cannot be correctly measured by a thermometer, as when the cable is in a tank, sometimes full of water, sometimes without, or when it is paid out into the sea, the temperature of the cable may be calculated by its copper resistance, when this resistance at 75° F.
What to read after A Guide for the Electric Testing of Telegraph Cables?
You can find similar books in the "Read Also" column, or choose other free books by Hoskiær, Otto Valdemar, 1829-1895 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
29 X I ' calculated at 75° F. -will, with Hooper's core, be , or xl x 1' 026' (see Table II.). This number, with which it has been necessary to divide or multiply the result, so as to reduce from one temperature to another, is termed the temperature coefficient. When therefore the insulation has been measured at t degrees below 75°, the insulation per knot at 75° will be nxv' X (t>10000xl DXU'x 1-026' ' The resistance at 75° F. for gutta-percha will be found by using in the formula, instead of ...l - 026* as with Hooper's core, 1"076* with ordinary gutta-percha (see Table III.), and 1'080* with Willoughby Smith's gutta-percha (see Table IV.).
If the constant of the galvanometer is taken with the whole battery, a shunt v' = 100, and a resistance of 10,000 Ohms, then the insulation at the observed temperature will v vl "When the temperature cannot be correctly measured by a thermometer, as when the cable is in a tank, sometimes full of water, sometimes without, or when it is paid out into the sea, the temperature of the cable may be calculated by its copper resistance, when this resistance at 75° F.
What to read after A Guide for the Electric Testing of Telegraph Cables?
You can find similar books in the "Read Also" column, or choose other free books by Hoskiær, Otto Valdemar, 1829-1895 to read onlineMoreLess
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